import { asyncRouterMap, constantRouterMap } from '@/router'
//
import { buildTree } from '../../utils/index.js';

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param routes asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(routes, roles) {
  const res = []

  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRouter(tmp.children, roles)
      }
      res.push(tmp)
    }
  })

  return res
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: [],
    routerMenuTree: {},
    //  选中一级菜单
    checkedMneu: {}
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)

      /**
       * 取路由结构树
       */
      let arr = [];
      for (let item of state.routers) {
          if (item.path === '') {
              arr = item.children;
              break;
          }
      }
      let arr2 = [];
      for (let item of arr) {
          if (item.meta && item.meta.type && item.meta.type !== 'menu') {

          } else {
              arr2.push(item);
          }
      }
      state.routerMenuTree = buildTree(arr2, '', 'path', 'pPath', 'children') || {}
    },
    set_checkedMneu: (state, menu) => {
      let checkedMneu = {};
      for (let item of menu) {
          if (item.checked) {
            checkedMneu = item;
              break;
          }
      }
      state.checkedMneu = checkedMneu;
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const { roles } = data
        let accessedRouters
        if (roles.includes('admin')) {
          accessedRouters = asyncRouterMap
        } else {
          accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
        }
        commit('SET_ROUTERS', accessedRouters)
        resolve()
      })
    }
  }
}

export default permission
